// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_MESSAGE_CENTER_BOUNDED_LABEL_H_
#define UI_MESSAGE_CENTER_BOUNDED_LABEL_H_

#include <list>
#include <map>

#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/message_center/message_center_export.h"
#include "ui/views/view.h"

namespace gfx {
class FontList;
}

namespace message_center {

class InnerBoundedLabel;

namespace test {
    class BoundedLabelTest;
}

// BoundedLabels display left aligned text up to a maximum number of lines, with
// ellipsis at the end of the last line for any omitted text. BoundedLabel is a
// direct subclass of views::Views rather than a subclass of views::Label
// to avoid exposing some of views::Label's methods that can't be made to work
// with BoundedLabel. See the description of InnerBoundedLabel in the
// bounded_label.cc file for details.
class MESSAGE_CENTER_EXPORT BoundedLabel : public views::View {
public:
    BoundedLabel(const base::string16& text, const gfx::FontList& font_list);
    BoundedLabel(const base::string16& text);
    ~BoundedLabel() override;

    void SetColors(SkColor textColor, SkColor backgroundColor);
    void SetLineHeight(int height); // Pass in 0 for default height.
    void SetLineLimit(int lines); // Pass in -1 for no limit.
    void SetText(const base::string16& text); // Additionally clears caches.

    int GetLineHeight() const;
    int GetLineLimit() const;

    // Pass in a -1 width to use the preferred width, a -1 limit to skip limits.
    int GetLinesForWidthAndLimit(int width, int limit);
    gfx::Size GetSizeForWidthAndLines(int width, int lines);

    // views::View:
    int GetBaseline() const override;
    gfx::Size GetPreferredSize() const override;
    int GetHeightForWidth(int width) const override;
    void OnPaint(gfx::Canvas* canvas) override;
    bool CanProcessEventsWithinSubtree() const override;
    void GetAccessibleState(ui::AXViewState* state) override;

protected:
    // Overridden from views::View.
    void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
    void OnNativeThemeChanged(const ui::NativeTheme* theme) override;

private:
    friend class test::BoundedLabelTest;

    base::string16 GetWrappedTextForTest(int width, int lines);

    scoped_ptr<InnerBoundedLabel> label_;
    int line_limit_;

    DISALLOW_COPY_AND_ASSIGN(BoundedLabel);
};

} // namespace message_center

#endif // UI_MESSAGE_CENTER_BOUNDED_LABEL_H_
